Improvement in feed-regulators for injectors



l. A. MARDEN 8: T. 8. SMITH.

Feed-Regulators for injectors.

Patented Oct. 28,1873;

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UNITED STATES PAT JEREMIAH A. MARDEN, OF BOSTON, AND THEOPHILUS S. SMITH, 'OF SOM- ERVILLE, ASSIGNORS OF ONE-THIRD THEIR RIGHT TO THEOPHILUS GILMAN SMITH, .OF SOMERVILLE, MASSACHUSETTS.

IMPROVEMENT IN FEED-REGULATQRS FOR iNJECTQRS.

Specification forming part of Letters Patent No. 143,988. dated October 28, 1873 application filed November 30, 1872.

To all whom it may concern:

Be it known that we, JEREMIAH A. MAR- DEN, of Boston, in the county of Suffolk, and

THEoPHrLUs S. SMITH, of Somerville, in the county of MiddleseX, both in the State of Massachusetts, have invented an Improved Feed-Regulator for Injectors, of which the following is a specification:

This invention relates toa method of governing automatically the supply of water in the feed-pipe of an injector, so that it shall correspond with the pressure of steam which is being used to drive the said water, so that the supply shall at no time be too great for the steam-pressure, but shall be regulated to correspond therewith.

It is well known to engineers that, if the feed or suction. pipe of an injector be of suflicient size to supply the injector at above a hundred pounds pressure to the square inch, such pipe will be too large, and the supply too great at a pressure much below that point, and the inj ector-will become inoperative unless the suppipe by a tube, and, isprovided with a diaphragm of rubber or other suitable elastic material stretched across it. This diaphragm operates one end of a rod, the other end of which is provided with a rack operating a pinion affixed to a shaft, upon which is mounted a valve arrangedwithin the feed-pipe. A coiled spring capable of adjustment is employed to regulate the action of the diaphragm and parts connected therewith; but, that our invention may be fully understood, we will proceed to describe the same more in detail by aid of the accompanyung drawings.

Figure 1 shows an external front view of an inj ector with our improvements applied thereto. Fig. 2 represents a vertical section of parts.

a is the injector, and bthe steam-pipe, which is provided with a branch pipe, I), in connection with a chamber, A, which has a diaphragm, B, of rubber or other suitable elastic material, stretched across it. C is a rod, one end, 0 of which is operated by the diaphragm B, and is capable of being moved outward from this chamber B against a spring, D, by means of steam-pressure, which is let into the chamber A by the pipe 11 upon the opposite side of the diaphragm This rod 0, at its end C is provided with a rack, E, which operates a pinion, F, fixed on the shaft F, upon which is mounted a regulati ngvalve, G, arranged within the feed-pipeI-I. The spring I) is so constructed that, by its increased resistance as it is compressed, it shall balance a greater pressure on the diaphragm B, and by adjusting the spring D, and forming it of proper stiffness, the valve G will be opened or closed as the pressure of steam increases or diminishes, thereby regulating the supply of water through the feedpipe H.

Having thus described our invention, what we claim, and desire to secure by Letters Iatcut, is--- y In combination with an injector, a, and pipes b b, the chamber A, diaphragm B, rod 0, spring D, rack E, pinion F, shaft F, and regulatingvalve G, arranged and operating substantially as and for the purposes specified.

JEREMIAH A. MARDEN. 'THEOPHILUS S. SMITH. Witnesses: J osEPH B. GARDINER, F. M. PAUL. 

